Lemon (Citrus limonum)
The fruit of the lemon grows in the Mediterranean and subtropical regions, and is mainly grown in Spain and Portugal. It is also very popular in California. The essential oil is obtained by cold distillation of fresh zest. It takes about 3000 lemons to get 1L of essential oil!
Lemon is very rich in vitamins A, C, PP and especially B. Provitamin A is found in the skin of the fruit.